This chapter addresses current marital status, age at first marriage, and age at sexual initiation. Marriage is a primary indication of the exposure of women to the risk of pregnancy and, therefore, is important for the understanding of fertility. Populations in which age at marriage is low tend to be populations with early childbearing and high fertility. For this reason, there is an interest in trends in age at marriage. The chapter also includes information on age at first sexual intercourse, which in some countries is a more direct measure of the beginning of exposure to pregnancy and the level of exposure.